Definition of "galaxy" []

Any of numerous large-scale aggregates of stars, gas, and dust that constitute the universe, containing an average of 100 billion (1011) solar masses and ranging in diameter from 1,500 to 300,000 light-years. Also called nebula.(noun)

The Milky Way.(noun)

An assembly of brilliant, glamorous, or distinguished persons or things: a galaxy of theatrical performers. (noun)

Any of a vast number of star systems held together by gravitational attraction in an asymmetric shape (an irregular galaxy) or, more usually, in a symmetrical shape (a regular galaxy), which is either a spiral or an ellipse(noun)